Hourly sum values represent an integration over time. Basically by summing the readings over the number of seconds in the measurement period, the units of radiant power are converted to radiant energy and are useful for studying daily effects related to daily exposure. Current available values are Caldwell biological spectral weighting function, Flint biological spectral weighting function, erythemally weighted irradiance, UV-A irradiance, and UV-B irradiance. To insure quality data, the In Situ calibrated data is available through the previous month.
Please note we now have an FTP Access, to download site/sites, year/years of data.
The hourly sums are processed monthly. The current month's data will be available at the beginning of the next month.
Valid date range for location Alaska, Fairbanks, AK02 is from Sat Aug 26 00:00:00 GMT+00:00 2000 to Tue Jun 30 03:21:00 GMT+00:00 2020